diff --git a/dc09_spt/dc09_spt.py b/dc09_spt/dc09_spt.py
index 7a22bb2..b017e83 100644
--- a/dc09_spt/dc09_spt.py
+++ b/dc09_spt/dc09_spt.py
@@ -236,6 +236,7 @@ def send_msg(self, mtype, mparam):
                 current implemented is :
                     'SIA' or 'SIA-DCS' for sending a message with a SIA-DC03 payload
                     'CID' or 'ADM-CID' for sending a message with a SIA-DC05 payload
+                    'CONTACT-ID' for sending a message with a SIA-DC05 payload
             mparam
                 a map of key value pairs defining the message content.
                 for a description of possible values see the documentation of the payload
@@ -257,6 +258,9 @@ def send_msg(self, mtype, mparam):
         if mtype == 'CID' or mtype == 'ADM-CID':
             msg = dc05_msg.dc05event(self.account, mparam)
             dc09type = 'ADM-CID'
+        if mtype == 'CONTACT-ID':
+            msg = dc05_msg.conactid2dc05(self.account, mparam)
+            dc09type = 'ADM-CID'
         extra = dc09_msg.dc09_extra(mparam)
         if extra is not None:
             msg = msg + extra
diff --git a/dc09_spt/msg/dc05_msg.py b/dc09_spt/msg/dc05_msg.py
index 436adbe..720a53a 100644
--- a/dc09_spt/msg/dc05_msg.py
+++ b/dc09_spt/msg/dc05_msg.py
@@ -82,7 +82,7 @@ def dc05event(spt_account,  params={}):
         if len(code) != 3:
             raise Exception('Code should be 3 positions')
         q = param.numpar(params,  'q', '1')
-        if q != '1' and q != '3' and q != '3':
+        if q not in ['1', '3', '6']:
             raise Exception('Qualifier q should be 1 or 3 or 6')
         area = param.numpar(params,  'area', '00')
         if len(area) != 2:
@@ -96,3 +96,60 @@ def dc05event(spt_account,  params={}):
                 zone = ('000' + zone)[-3:]
             msg += q + code + ' ' + area + ' ' + zone + ']'
         return msg 
+  
+    @staticmethod
+    def conactid2dc05(spt_account,  params={}):   
+      """
+      Construct a DC05 message, also called Ademco Contact ID
+      Parameters
+          spt_account
+              the account of the alarm transceiver.
+              in most situations this will be used in the alarm message too, but for situations like
+              a cloud based receiver, the account in the map will be different.
+          params
+              a map with key-value pairs.
+              at this moment only the more commonly used fields are used.
+              the currently handled keys are:
+                  account
+                      the account number.
+                      most receivers expect 4 to 8 numeric digits
+                  area
+                      the area number in which the event happened
+                      (area is a part of an installation that can arm and disarm independently)
+                  zone
+                      the alarm zone.
+                  code
+                      the event code in 3 numbers according to the DC05 standard.
+                  q
+                      the qualifier defining the state of the alarm.
+                      1 means new alarm
+                      3 means new restore
+                      6 means old alarm
+      """
+      account = param.strpar(params,  'account',  spt_account)
+      zone = param.numpar(params, 'zone',  '000')
+      area = param.numpar(params, 'area', '00')
+      qualifier = param.numpar(params, 'q', '1')
+      event_code = param.numpar(params, 'code', '602')
+      
+      if len(event_code) != 3:
+          raise ValueError("Event code should be 3 digits")
+      
+      if qualifier not in ['1', '3', '6']:
+          raise ValueError("Qualifier should be 1 (new event) or 3 (restore) or 6 (old event)")
+
+      qualifier_code = qualifier + event_code
+      
+      parts = [account, '18', qualifier_code, area, zone]
+
+      # Calculate checksum
+      total = sum(int(digit) if digit != '0' else 10 for part in parts for digit in part)
+      next_multiple = ((total // 15) + 1) * 15
+      checksum = next_multiple - total 
+      checksum = checksum if checksum != 0 else 'F'
+      
+      # Complete message with checksum
+      complete_message = ' '.join(parts) + ' ' + str(checksum) + ']'
+      return complete_message
+
+      
diff --git a/setup.py b/setup.py
index 6cd6f0b..35e6d23 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,7 @@
     ],
     python_requires='>=3.6',
     install_requires=[
-    	'cryptograpy>=3.1'
+    	'cryptography>=3.1'
     	]
 )